PCB and ANALOG (very basic) design

this project is a typical design usign a microcontrollers, pwm output with 2nd order rc lowpass filter then this signal go to op amp non inverted amplifier configuration, the op amp output must be boosted (with bjt or fet) I hope at 100ma minimun current at 0-10 volts output. The relays control is using bjt transistor with diode, buttons and leds are typically circuits, for RS485 we Will use pcb modules and thats it.

Microcontroller, relay, rs485 module and power supply are specific i Will give you all details before to start the design

CHECK ATTACHED IMAGE